Fix extraction of files with size greater than one erase block.

A regression was introduced with commit 70a2345 where we only took inode
nodes with the highest version into account when extracting files from a
JFFS2 filesystem.

When files have a size greater than 1 erase block, the file is split
into multiple JFFS2 inode nodes having the same inode (they belong to
the same file) but different versions. These files should be recreated
on disk by walking through the list of inode nodes, order by version.
Each node has an offset within the file so we simply seek in the output
file and write the node content in place.

Reference: https://sourceware.org/jffs2/jffs2-slides-transformed.pdf

src/scripts/jefferson

@@ -318,10 +318,9 @@ def scan_fs(content, endianness, verbose=False):
                     inode.unpack(content_mv[0 + offset :])
 
                     if inode.ino in fs[JFFS2_NODETYPE_INODE]:
-                        if inode.version > fs[JFFS2_NODETYPE_INODE][inode.ino].version:
-                            fs[JFFS2_NODETYPE_INODE][inode.ino] = inode
+                        fs[JFFS2_NODETYPE_INODE][inode.ino].append(inode)
                     else:
-                        fs[JFFS2_NODETYPE_INODE][inode.ino] = inode
+                        fs[JFFS2_NODETYPE_INODE][inode.ino] = [inode]
                     if verbose:
                         print("0x%08X:" % (offset), inode)
                 elif unknown_node.nodetype == JFFS2_NODETYPE_CLEANMARKER:
@@ -358,15 +357,17 @@ def get_device(inode):
         return os.makedev((node.old_id >> 8) & 0xFF, node.old_id & 0xFF)
     return None
 
+def sort_version(item):
+    return item.version
 
 def dump_fs(fs, target):
     node_dict = {}
 
     for dirent in fs[JFFS2_NODETYPE_DIRENT].values():
         dirent.inodes = []
-        for inode in fs[JFFS2_NODETYPE_INODE].values():
-            if inode.ino == dirent.ino:
-                dirent.inodes.append(inode)
+        for ino, inodes in fs[JFFS2_NODETYPE_INODE].items():
+            if ino == dirent.ino:
+                dirent.inodes = sorted(inodes, key=sort_version)
         node_dict[dirent.ino] = dirent
 
     for dirent in fs[JFFS2_NODETYPE_DIRENT].values():